caravalho wouldn't talk to us, but he told us by email that he was trying to help. we showed his memo to general chiarelli. >> were you aware of this memo before yesterday or today? >> no, i wasn't. i've asked my lawyers to look at it, okay, to make sure that we have not made this more restrictive than the army regulation. >> chiarelli says some soldiers with t.b.i.s have received purple hearts. but the pentagon told us they don't know how many and they don't know how many have been denied. >> i appreciate you bringing this to my attention, i will go down range and insure that i talk to them and let them know that they need to be more in line with the regulation. we asked officials at the pentagon what's the purple heart policy in afghanistan now that the fighting and explosions are shifting there. they said, they're revising the policy. meanwhile, the military says they're making progress. they've just opened a center to study traumatic brain injury and they've rolled out a new policy designed to improve diagnosis and treatment. but, for soldiers like michelle dyar